Publications


Dependence of intrinsic rotation reversals on collisionality in MAST

NUCLEAR FUSION 55 (2015) ARTN 032003

JC Hillesheim, FI Parra, M Barnes, NA Crocker, H Meyer, WA Peebles, R Scannell, A Thornton, MAST Team


Weak collisionless shocks in laser-plasmas

Plasma Physics and Controlled Fusion 57 (2015)

RA Cairns, R Bingham, RGM Trines, P Norreys

© 2015 IOP Publishing Ltd. We obtain a theory describing laminar shock-like structures in a collisionless plasma and examine the parameter limits, in terms of the ion sound Mach number and the electron/ion temperature ratio, within which these structures exist. The essential feature is the inclusion of finite ion temperature with the result that some ions are reflected from a potential ramp. This destroys the symmetry between upstream and downstream regions that would otherwise give the well-known ion solitary wave solution. We have shown earlier (Cairns et al 2014 Phys. Plasmas 21 022112) that such structures may be relevant to problems such as the existence of strong, localized electric fields observed in laser compressed pellets and laser acceleration of ions. Here we present results on the way in which these structures may produce species separation in fusion targets and suggest that it may be possible to use shock ion acceleration for fast ignition.


INTERMITTENCY AND ALIGNMENT IN STRONG RMHD TURBULENCE

ASTROPHYSICAL JOURNAL 807 (2015) ARTN 39

BDG Chandran, AA Schekochihin, A Mallet


Electron-ion temperature equilibration in warm dense tantalum

HIGH ENERGY DENSITY PHYSICS 14 (2015) 1-5

NJ Hartley, P Belancourt, DA Chapman, T Doeppner, RP Drake, DO Gericke, SH Glenzer, D Khaghani, S LePape, T Ma, P Neumayer, A Pak, L Peters, S Richardson, J Vorberger, TG White, G Gregori


Simplified models for dark matter searches at the LHC

PHYSICS OF THE DARK UNIVERSE 9-10 (2015) 8-23

J Abdallah, H Araujo, A Arbey, A Ashkenazi, A Belyaev, J Berger, C Boehm, A Boveia, A Brennan, J Brooke, O Buchmueller, M Buckley, G Busoni, L Calibbi, S Chauhan, N Daci, G Davies, I De Bruyn, P De Jong, A De Roeck, K de Vries, D Del Re, A De Simone, A Di Simone, C Doglioni, M Dolan, HK Dreiner, J Ellis, S Eno, E Etzion, M Fairbairn, B Feldstein, H Flaecher, E Feng, P Fox, M-H Genest, L Gouskos, J Gramling, U Haisch, R Harnik, A Hibbs, S Hoh, W Hopkins, V Ippolito, T Jacques, F Kahlhoefer, VV Khoze, R Kirk, A Korn, K Kotov, S Kunori, G Landsberg, S Liem, T Lin, S Lowette, R Lucas, L Malgeri, S Malik, C McCabe, AS Mete, E Morgante, S Mrenna, Y Nakahama, D Newbold, K Nordstrom, P Pani, M Papucci, S Pataraia, B Penning, D Pinna, G Polesello, D Racco, E Re, AW Riotto, T Rizzo, D Salek, S Sarkar, S Schramm, P Skubic, O Slone, J Smirnov, Y Soreq, T Sumner, TMP Tait, M Thomas, I Tomalin, C Tunnell, A Vichi, T Volansky, N Weiner, SM West, M Wielers, S Worm, I Yavin, B Zaldivar, N Zhou, K Zurek


On the interpretation of dark matter self-interactions in Abell 3827

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452 (2015) L54-L58

F Kahlhoefer, K Schmidt-Hoberg, J Kummer, S Sarkar


Evidence of locally enhanced target heating due to instabilities of counter-streaming fast electron beams

PHYSICS OF PLASMAS 22 (2015) ARTN 020701

P Koester, N Booth, CA Cecchetti, H Chen, RG Evans, G Gregori, L Labate, T Levato, B Li, M Makita, J Mithen, CD Murphy, M Notley, R Pattathil, D Riley, N Woolsey, LA Gizzi


Identification of globular cluster stars in RAVE data - I. Application to stellar parameter calibration

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451 (2015) 1229-1246

B Anguiano, DB Zucker, R-D Scholz, EK Grebel, G Seabroke, A Kunder, J Binney, PJ McMillan, T Zwitter, RFG Wyse, G Kordopatis, O Bienayme, J Bland-Hawthorn, C Boeche, KC Freeman, BK Gibson, G Gilmore, U Munari, J Navarro, Q Parker, W Reid, A Siebert, A Siviero, M Steinmetz, F Watson


Less constrained omnigeneous stellarators

NUCLEAR FUSION 55 (2015) ARTN 033005

FI Parra, I Calvo, P Helander, M Landreman


Calibration of time of flight detectors using laser-driven neutron source.

The Review of scientific instruments 86 (2015) 073308-

SR Mirfayzi, S Kar, H Ahmed, AG Krygier, A Green, A Alejo, R Clarke, RR Freeman, J Fuchs, D Jung, A Kleinschmidt, JT Morrison, Z Najmudin, H Nakamura, P Norreys, M Oliver, M Roth, L Vassura, M Zepf, M Borghesi

Calibration of three scintillators (EJ232Q, BC422Q, and EJ410) in a time-of-flight arrangement using a laser drive-neutron source is presented. The three plastic scintillator detectors were calibrated with gamma insensitive bubble detector spectrometers, which were absolutely calibrated over a wide range of neutron energies ranging from sub-MeV to 20 MeV. A typical set of data obtained simultaneously by the detectors is shown, measuring the neutron spectrum emitted from a petawatt laser irradiated thin foil.


Intrinsic rotation in tokamaks: theory

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 045002

FI Parra, M Barnes


Gaia-ESO Survey: Analysis of pre-main sequence stellar spectra

ASTRONOMY & ASTROPHYSICS 576 (2015) ARTN A80

AC Lanzafame, A Frasca, F Damiani, E Franciosini, M Cottaar, SG Sousa, HM Tabernero, A Klutsch, L Spina, K Biazzo, L Prisinzano, GG Sacco, S Randich, E Brugaletta, E Delgado Mena, V Adibekyan, D Montes, R Bonito, JF Gameiro, JM Alcala, JI Gonzalez Hernandez, R Jeffries, S Messina, M Meyer, G Gilmore, M Asplund, J Binney, P Bonifacio, JE Drew, S Feltzing, AMN Ferguson, G Micela, I Negueruela, T Prusti, H-W Rix, A Vallenari, EJ Alfaro, C Allende Prieto, C Babusiaux, T Bensby, R Blomme, A Bragaglia, E Flaccomio, P Francois, N Hambly, M Irwin, SE Koposov, AJ Korn, R Smiljanic, S Van Eck, N Walton, A Bayo, M Bergemann, G Carraro, MT Costado, B Edvardsson, U Heiter, V Hill, A Hourihane, RJ Jackson, P Jofre, C Lardo, J Lewis, K Lind, L Magrini, G Marconi, C Martayan, T Masseron, L Monaco, L Morbidelli, L Sbordone, CC Worley, S Zaggia


Observation of magnetic field generation via the Weibel instability in interpenetrating plasma flows

NATURE PHYSICS 11 (2015) 173-176

CM Huntington, F Fiuza, JS Ross, AB Zylstra, RP Drake, DH Froula, G Gregori, NL Kugland, CC Kuranz, MC Levy, CK Li, J Meinecke, T Morita, R Petrasso, C Plechaty, BA Remington, DD Ryutov, Y Sakawa, A Spitkovsky, H Takabe, H-S Park


Fluctuation-dissipation relations for a plasma-kinetic Langevin equation

Journal of Plasma Physics 81 (2015)

A Kanekar, AA Schekochihin, W Dorland, NF Loureiro

© 2014 Cambridge University Press. A linearised kinetic equation describing electrostatic perturbations of a Maxwellian equilibrium in a weakly collisional plasma forced by a random source is considered. The problem is treated as a kinetic analogue of the Langevin equation and the corresponding fluctuation-dissipation relations are derived. The kinetic fluctuation-dissipation relation reduces to the standard fluid one in the regime where the Landau damping rate is small and the system has no real frequency; in this case the simplest possible Landau-fluid closure of the kinetic equation coincides with the standard Langevin equation. Phase mixing of density fluctuations and emergence of fine scales in velocity space is diagnosed as a constant flux of free energy in Hermite space; the fluctuation-dissipation relations for the perturbations of the distribution function are derived, in the form of a universal expression for the Hermite spectrum of the free energy. Finite-collisionality effects are included. This work is aimed at establishing the simplest fluctuation-dissipation relations for a kinetic plasma, clarifying the connection between Landau and Hermite-space formalisms, and setting a benchmark case for a study of phase mixing in turbulent plasmas.


Simulation of density measurements in plasma wakefields using photon acceleration

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 18 (2015) ARTN 032801

MF Kasim, N Ratan, L Ceurvorst, J Sadler, PN Burrows, R Trines, J Holloway, M Wing, R Bingham, P Norreys


Marginal evidence for cosmic acceleration from Type Ia supernovae

(2015)

JT Nielsen, A Guffanti, S Sarkar


Editorial Special issue: Macroscopic randomness in astrophysical plasmas: The legacy and vision of Ya. B. Zeldovich

JOURNAL OF PLASMA PHYSICS 81 (2015) ARTN 391810403

A Shukurov, D Sokoloff, A Schekochihin


The Gaia-ESO Survey: Empirical determination of the precision of stellar radial velocities and projected rotation velocities

ASTRONOMY & ASTROPHYSICS 580 (2015) ARTN A75

RJ Jackson, RD Jeffries, J Lewis, SE Koposov, GG Sacco, S Randich, G Gilmore, M Asplund, J Binney, P Bonifacio, JE Drew, S Feltzing, AMN Ferguson, G Micela, I Neguerela, T Prusti, H-W Rix, A Vallenari, EJ Alfaro, CA Prieto, C Babusiaux, T Bensby, R Blomme, A Bragaglia, E Flaccomio, P Francois, N Hambly, M Irwin, AJ Korn, AC Lanzafame, E Pancino, A Recio-Blanco, R Smiljanic, S Van Eck, N Walton, A Bayo, M Bergemann, G Carraro, MT Costado, F Damiani, B Edvardsson, E Franciosini, A Frasca, U Heiter, V Hill, A Hourihane, P Jofre, C Lardo, P de Laverny, K Lind, L Magrini, G Marconi, C Martayan, T Masseron, L Monaco, L Morbidelli, L Prisinzano, L Sbordone, SG Sousa, CC Worley, S Zaggia


Equivalence of two different approaches to global delta f gyrokinetic simulations

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 054003

FI Parra, M Barnes


Gas density fluctuations in the Perseus Cluster: clumping factor and velocity power spectrum

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 450 (2015) 4184-4197

I Zhuravleva, E Churazov, P Arevalo, AA Schekochihin, SW Allen, AC Fabian, WR Forman, JS Sanders, A Simionescu, R Sunyaev, A Vikhlinin, N Werner